Extremely Flammable : Liquid substances and preparations having an extremely low flashpoint and a low boiling point and gaseous substances and preparations which are flammable in contact with air at ambient temperature and pressure.

Sensitising : Substances and preparations which, if they are inhaled or if they penetrate the skin, are capable of eliciting a reaction by hyper-sensitisation such that on further exposure to the substance or preparation, characteristic adverse effects are produced